The Slash'EM Dungeons

This spoiler lists all the special levels and branches which can
appear in the Slash'EM dungeons. Note that special levels can be
accessed in three different ways. Some appear in place of normal
dungeon levels, some are reached by extra stairs down or up, and some
are reached via a magic portal. In the latter two cases, the
``Location'' column in the table refers to the levels where the stairs
or portal can be found. ``Dn'' refers to level n in the Dungeons of
Doom, and ``Gn'' refers to level n in Gehennom - G1 is the Valley of
the Dead.

Level/branch name

Location

Method of access

Probability of occurring

Comments

Elemental Planes

D1

Go up with the Amulet

100%

The Gnomish Mines

D2-4

Stairs down

100%

Slash'EM has a new Mine King level, one level below the Mine End
level which also exists in vanilla Nethack.

Mall

D5-6

Normal dungeon

75%

Oracle

D7-9

Normal dungeon

100%

Sokoban

One level below Oracle

Stairs up

100%

Rats

D10-11

Normal dungeon

50%

Kobolds

D11-12

Normal dungeon

50%

Grund's Stronghold

D12-13

Stairs down

100%

The Quest

D15-19

Portal

100%

Until you complete the Quest, you will get a message every time
you enter the level with the Quest portal.

Lawful Quest

D15-19

Portal

100%

Kill Nightmare to get Nighthorn and the Key of Law.

Neutral Quest

D15-19

Portal

100%

Kill the Beholder to get the Eye of the Beholder and the Key of
Neutrality.